I have the vinyl tablecovering over the machine/table, with a cutout for the feed dogs. It slides well, but the movement of the quilt pulls the tape up and the vinyl curls a bit. Not as smooth as I'd like, but better than none at all. I've tried all kinds of tape and had the same results. Every so often, I turn it around and cut out a new section. When I've cut a few holes in it, I buy new and start over.
When I'm doing FMQ and the feed dogs are down, I use the slider on top of the heavy weight vinyl. It is more slippery than the vinyl, which I like right at the area that's being quilted.
I really like the slider and think it's worth the money.